A little about myself, I have been building my powerwall for quite some time at them moment, and have managed to find a reliable cell supply, at the time of this writting I have around 3500 cells which I plan to use in a 20kw powerwall I am in the process of building

I have built an initial powerwall in a 7s80p configuration and a few other packs which are used for several purposes
I have 8 310 Silfab solar panels which are setup in my roof which I have in a 2s4p configuration

I have purchased a few months ago a Esmart3 60A solar charge controller which appeared to work very well with a 12v lead acid battery but it has not been very kind to me after connecting my lithium 7s bank, here is what I have found:

1) Voltage reading from the battery is off by 2.6v (lower, 28.6v reading would show as 26v) when the voltage is between 23v and 28v (quite a nuisance, however tolerable)

2) This is my biggest issue because it is potentially very dangerous is that it will NOT change from constant current to constant voltage, it continues dumping power into the battery as if it did not reach the final voltage setup in the "user defined" battery

I have setup the solar charge controller through the android based software which is somewhat useful, please see in the my screenshot the settings for my 7s battery pack,

Has anyone had this before and has any ideas in how to correct these issues?

I had 7s80p before i added another 7s80p to it.
In my case i use Epever Tracer 3210.
It works fine with no problem.
These are my settings
Make sure you set the working voltage to 24V battery system.
Using user define setting
Bulk charge voltage is 29.3
float charge voltage is 29.2boo
Equalize charge voltage is 29.4
Charge limit is 30.0
Over voltage protection is 32.0
Over voltage protection recovery is 30.0
Boost recovery is 26.4
Equalize time is
Boost time is 180min.
I think if you adopt these settings on your esmart3 it will work as well.

(10-19-2018, 06:48 AM)ibikunle Wrote: I had 7s80p before i added another 7s80p to it.
In my case i use Epever Tracer 3210.
It works fine with no problem.
These are my settings
Make sure you set the working voltage to 24V battery system.
Using user define settings
Bulk charge voltage is 29.3
float charge voltage is 29.2
Equalize charge voltage is 29.4
Charge limit is 30.0
Over voltage protection is 32.0
Over voltage protection recovery is 30.0
Boost recovery is 26.4
Equalize time is 180min
Boost time is 180min.
I currently have 900w of panels and i pull maximum current of 27A with it.
I think if you adopt these settings on your esmart3 it will work as well.

Hi ibikunle,
Thank you for your response
As mentioned I did play with the settings quite a bit to no avail, I do have a different solar charge controller, an Esmart3 and to this moment I have not been able to make it stop charging once the target voltage is reached.

(10-19-2018, 05:54 PM)wycito Wrote: Hi ibikunle,
Thank you for your response
As mentioned I did play with the settings quite a bit to no avail, I do have a different solar charge controller, an Esmart3 and to this moment I have not been able to make it stop charging once the target voltage is reached.

I know the charge controller you are taking about Esmart3 it is red in colour.
Just take your time for the setting i know you can do it.

I bypass all that when charging with solar, I try to get the controller to get me as close as possible to what I want and use an overvoltage relay to disconnect the solar panel when the battery voltage reaches my limit I set for it.

To me it look like you have your bulk voltage set too high if the battery keeps going over its maximum voltage. Like the other post said, it takes a while to find the right bulk voltage that will work for your system. I had lithium controllers that also would go over the maximum voltage that I set for them, thats why I don't trust controllers to protect my batteries, they can also fail. That where the overvoltage relay comes in, plus I have the battery BMS as last line of defense. I also use active balancers on my batteries so the overall voltage is in perfect balance even when fast charging.

This is how I have my system set up, the 6 dollar overvoltage relay monitor battery voltage, if voltage goes above my limits I set, it triggers a 30 amp relay that disconnects the solar panel, the controller goes to sleep thinking its night time. I use a 30 amp relay but you can use a much larger 300 amp relay depending on what kind of power your panels put out. I have my controller dialed in so well, that this overvoltage relay rarely has to disconnect the panel, but its very good protection to protect your expensive batteries. Its like a deadman switch, everyone need one in there systems. Works with any controller/charger any battery system.

After a few communications with the seller I have found how to set it up correctly

The voltage settings have to be done based as a multiple of 12v battery, i.e
7S system is a "24v" system so I would need to setup the top voltage to half of what I want it to be -> I use 28.6v as max voltage the setting need to be as 28.6v/2 -> 14.3v
I use 24.4v as my minimum voltage so I have to set the low voltage limit to 12.2v

Once I did this the Charge controller started behaving correctly and changing modes correctly

Regarding the voltage readings the seller connected to a computer running the software and entered a hidden menu where the voltages can be corrected

As it stands right now it is working as I expected, I am a happy camper now

I know this is an old thread, but I've found the way to correctly calibrate the eSmart3 MPPT Charge controller. First, you click onto the gear on the top-right corner and type solar888 as the admin password, then on the 3rd field down on the left, type the current voltage of your batteries (using a volt-meter) and accept the changes. Voila!, the voltage on the controller matches the one on your batteries. Mine was about .5v higher than the actual battery voltage.

PS: If the fields are in chineese, use a tool from google (Google Translator) and use the camera to view the translation in English.

(05-15-2019, 07:27 PM)DomingoRP Wrote: I know this is an old thread, but I've found the way to correctly calibrate the eSmart3 MPPT Charge controller. First, you click onto the gear on the top-right corner and type solar888 as the admin password, then on the 3rd field down on the left, type the current voltage of your batteries (using a volt-meter) and accept the changes. Voila!, the voltage on the controller matches the one on your batteries. Mine was about .5v higher than the actual battery voltage.

PS: If the fields are in chineese, use a tool from google (Google Translator) and use the camera to view the translation in English.

Awesome, Thank you!!! I knew about the existence of that menu, but couldn't find the password on the net. And the ftard aliexpress dealer was being a dhead about the issue.
Finally I can fully calibrate my 3 eSmart3 chargers. In practice the LCD showing inaccurate current/V was not a big issue, but still.

Awesome, Thank you!!! I knew about the existence of that menu, but couldn't find the password on the net. And the ftard aliexpress dealer was being a dhead about the issue.
Finally I can fully calibrate my 3 eSmart3 chargers. In practice the LCD showing inaccurate current/V was not a big issue, but still.

You're welcome. If we pay for the device, we have the right to do with it as we please.